Names Of Shoe Parts What Is The Name Of The Very End Of A Shoe Heel?

What is the name of the very end of a shoe heel? - names of shoe parts

The plastic part removed and replaced with a new one when they have exhausted replaced. I have several pairs of shoes (eg 10), it is necessary that the text, the partial charge (in iron) and the shoe repair place is me up to $ 7 $ 10 each, which is unfair! So I thought if I can buy the part, I do myself, but I do not know his name. PLEASE HELP.